The cost of serving a client is not on the invoice.
Two clients can sign the same contract at the same rate and sit on opposite sides of break-even, purely because one is cheap to serve and the other is not. The tickets, the escalations, the account management, the unbilled pre-sales and the steady stream of free advice never reach the account that caused them. Cost-to-serve modelling pushes that operational cost down to the client, so you finally know who actually contributes.
Cost and Profitability Consulting · 150+ models since 2010 · TDABC
In IT and digital services, cost-to-serve is the cost a blended rate forgets: support, escalations, account management, unbilled pre-sales and free advice. Two clients on the same contract can land on opposite sides of break-even because of it. Attribute that cost to the account and you get a ranked, defensible view of who really contributes, which almost always surprises the delivery team.
Some accounts are cheap to bill and expensive to keep.
Every services firm has them. The client who calls before reading the email, who needs a partner on every status call, who treats the support desk as an extension of their own team, who asks for "a quick look" that takes a day. None of it is on the statement of work, so none of it lands on their account. At a blended rate they look like everyone else, and because the rate is healthy, nobody questions them.
Meanwhile the disciplined client next to them, who scopes well and serves themselves, carries an equal share of the firm's overhead they barely use. The first account is quietly funded by the second. The only way to break the illusion is to attribute serving cost to the work each account actually causes.
The same inversion shows up in professional services, where a demanding client pulls unbilled partner time and costs several times more at the same rate, and internally in shared services, where one business unit's exceptions and rush requests cost far more to support than a clean one the same size.
FROM CONTRACT FEE TO REALISED MARGIN
Illustrative. The same waterfall that hides project margin hides client margin: serving cost, pre-sales and rework step down the fee before any realised margin is left.
Serving cost lands on the account that caused it.
Name the serving activities
Support tickets, escalations, account and project management, pre-sales, onboarding, change handling and the unbilled advice. The work that overhead really pays for.
Cost each per minute
A time equation prices a ticket, an escalation, an hour of account management from practical capacity, so serving cost is a number, not an impression.
Attribute to the client
Each account carries the cost of how it actually behaves, transaction by transaction, not an even slice of overhead.
Rank, then act
Accounts sort by true contribution. The expensive ones become candidates to reprice, re-tier or set a minimum, with the number behind each call.
Frequently asked questions
- What is cost-to-serve in IT services?
- The full cost of serving a client once support tickets, escalations, account management, unbilled pre-sales and free advice are counted, not just the cost of the project delivered. Two clients on the same contract can sit on opposite sides of break-even because one is expensive to serve and the other is not.
- Why does the P&L hide cost-to-serve?
- A services P&L buries serving cost below the project line, inside general overhead and a blended utilisation target. Because it is never attributed to the account that caused it, the account looks as profitable as its day rate suggests, even when support and pre-sales have quietly erased the margin.
- Do you have to drop expensive-to-serve clients?
- Rarely. The point is to see them. Once you know an account's true cost-to-serve you can reprice the service, change how you support it, move it to a lighter tier, or set a minimum that works, while keeping the relationship.
See which accounts are cheap to bill and expensive to keep.
The Profit Check needs no data upload. It points to where serving cost is most likely hiding, and what it is worth to correct.
- Duration
- 12 to 15 minutes
- You receive
- Score, 7 dimensions, sector benchmark
- Price
- Free, no email needed
Proof
A distributor in New Zealand. €1.335M of cost-to-serve made visible, then halved, and 830 loss-making customers brought down to 295.
Read the case study →Who you would be talking to
Miguel Guimarães, Founding Partner
Cost and profitability practitioner for 25+ years. Lectured alongside Professor Robert S. Kaplan at the CFO conference in Amsterdam (2009).
Call +351 910 313 731
